A gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds WordNet 3.0 & Open English WordNet

Tear gas, also known as a lachrymator agent or lachrymator, sometimes colloquially known as "mace" after the early commercial self-defense spray, is a chemical weapon that stimulates the nerves of the lacrimal gland in the eye to produce tears. Wikipedia

Non-lethal chemical weapon that cause severe eye and respiratory pain, skin irritation, bleeding, and blindness. Wikipedia Disambiguation

Non-lethal chemical weapon Wikidata

A gas that irritates mucous membranes in the eyes, nose, mouth and lungs, and causes tearing, pain, and sometimes blindness. OmegaWiki

Any substance that causes tears, such as tear gas. Wiktionary

Substance. Wiktionary (translation)

Any lachrymatory, non-lethal chemical compound that causes the eyes to sting and water and/or irritates the respiratory system, mostly used for controlling crowds during riots or as self-defense. Wiktionary

Chemical compound. Wiktionary (translation)